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Transparent Bone and Concave Ribs

Additional Sonographic Features of Lethal Osteogenesis Imperfecta

Glenn A. Rouse, MD

Andrew Song, MD

Diagnostic Ultrasound/Vascular Laboratory, Loma Linda University Medical Center, Loma Linda, California

Marie de Lange, RT(R), BS, RDMS, RDCS

Diagnostic Ultrasound/Vascular Laboratory, Loma Linda University Medical Center, 1124 Anderson St., Loma Linda, CA 92354

Osteogenesis imperfecta (OI), a rare connective tissue deformity, can be classified into four categories, one of which (type II) is lethal. Lethal OI can be detected with the use of ultrasound prenatally. The authors studied nine OI cases, seven type II OI cases, and two nonlethal cases. All seven type II OI cases had very short limbs. In six of the seven cases, the back wall of the limb bone was visible (transparent bone sign). In four of the seven cases, concave ribs were visualized in the transverse plane. An incidental finding, beaking of the anterior portion of the skull, was noted in five cases. The transparent bone sign and concave ribs were not observed in the two nonlethal cases of OI.

Key Words: concave ribs • lethal osteogenesis imperfecta • osteogenesis imperfecta type II • transparent bone • ultrasonography

Journal of Diagnostic Medical Sonography, Vol. 14, No. 6, 246-250 (1998)
DOI: 10.1177/875647939801400602


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